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View synonyms for side effect

side effect

or side-ef·fect

noun

  1. any effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant.
  2. any accompanying or consequential and usually detrimental effect:

    the side effects of air pollution.

side effect

noun

  1. any unwanted nontherapeutic effect caused by a drug Compare aftereffect
  2. any secondary effect, esp an undesirable one

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Word History and Origins

Origin of side effect1

First recorded in 1880–85

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